Double Flow Ring Seal Oil System Of Volvo

The inlet temperature of the generator is abnormally high

If the generator outlet air temperature and the stator coil temperature do not exceed the specified, the output of the generator may not be reduced, but the cause should be found out and adjusted in time; When the specified value is exceeded, the generator output should be reduced first and then checked.

The temperature rise of the generator coil and iron core is abnormal

(1) If the specified value is exceeded, the load should be rapidly reduced.

(2) Quickly check the cooling air temperature, check whether the dust filter is blocked.

(3) Check whether the inlet and outlet valve of the air cooler is closed.

The generator three-phase unbalanced current exceeds the standard

Handling:

When the three-phase unbalance current of the generator exceeds the specified value, check whether it is caused by transformer circuit fault. Otherwise, reduce the stator current so that it does not exceed the specified value, and closely monitor the temperature of each part of the generator. When it is found that the temperature rises abnormally and the unbalanced current increases, the machine should be stopped in an emergency. When connected to the grid, the unbalance current does not exceed 10% of the rated value, so reduce the output active power to see if the unbalance current becomes smaller. If it gets smaller, it's because of the extranet. The operation can be maintained. Or disconnect the external network.

When the generator is in operation, one of the indicators suddenly goes out of order or disappears

Handling:

Refer to the instructions of other instruments to check whether the instrument itself or its primary and secondary circuits are damaged. If the secondary circuit wire is damaged, try not to change the operation mode of the generator; If the normal operation of the generator is affected, reduce the load or shut down according to the actual situation.

The 6pt secondary voltage of the generator is gone

Phenomenon:

(1) The alarm disappears and the "generator end PT disconnection" alarm.

(2) The indicator of generator active power, reactive power and voltmeter is reduced or zero.

Handling:

(1) Change the excitation system of automatic adjustment to manual mode.

(2) exit the generator compound voltage locking overcurrent protection.

(3) Monitor and adjust generators through other instruments.

(4) Inform the steam turbine to monitor the generator.

(5) Check the PT circuit at the machine end. If the primary and secondary fuses are blown, replace them.

(6) After normal operation, put in the generator compound voltage locking overcurrent protection, and change the excitation regulation mode to automatic mode.

I. Functions and characteristics of the double flow ring sealing oil system of the generator manufacturer

Provide two independent circulating sealing oil sources for sealing tile

Ensure that the sealing oil pressure is higher than the gas pressure in the generator, ensure that the oil pressure on the hydrogen side and the air side of the sealing tile is equal, and the pressure difference is limited to about 0.085mpa.

The sealing oil is cooled by the sealing oil cooler to take away the heat generated by the friction loss between the sealing tile and the shaft and ensure that the tile and oil temperature are controlled within the required range. Through an oil filter, impurities in the oil are removed to ensure the cleanliness of the sealing oil.

Guangxi Dingbo Power Equipment Manufacturing Co., Ltd. established in 2006, is an manufacturer of diesel generator in China, which integrates design, supply, commissioning and maintenance of diesel generator set. Product covers Cummins, Perkins, Volvo, Yuchai, Shangchai, Deutz, Ricardo, MTU, Weichai etc. with power range 20kw-3000kw, and become their OEM factory and technology center.